newton_solver.h
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1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
3 
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License, or (at your option) any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
13 
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 
18 
19 
20 #ifndef LIBMESH_NEWTON_SOLVER_H
21 #define LIBMESH_NEWTON_SOLVER_H
22 
23 // Local includes
24 #include "libmesh/libmesh_common.h"
25 #include "libmesh/linear_solver.h"
27 #include "libmesh/diff_solver.h"
28 
29 // C++ includes
30 
31 namespace libMesh
32 {
33 
46 // ------------------------------------------------------------
47 // Solver class definition
48 class NewtonSolver : public DiffSolver
49 {
50 public:
55  explicit
57 
61  virtual ~NewtonSolver ();
62 
63  typedef DiffSolver Parent;
64 
69  virtual void reinit ();
70 
75  virtual unsigned int solve ();
76 
85 
94 
107 
115 
121 
122 protected:
123 
131 
138  Real line_search(Real tol, Real last_residual, Real& current_residual,
139  NumericVector<Number> &newton_iterate,
140  const NumericVector<Number> &linear_solution);
141 
146  void print_convergence(unsigned int step_num,
147  Real current_residual,
148  Real step_norm,
149  bool linear_solve_finished);
150 
155  bool test_convergence(Real current_residual,
156  Real step_norm,
157  bool linear_solve_finished);
158 };
159 
160 
161 } // namespace libMesh
162 
163 
164 #endif // LIBMESH_NEWTON_SOLVER_H

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